A 26 g piece of magnesium at 160 °C was placed in a calorimeter with 100 g of water at 25 °C. The final temperature was 40°C. What is the specific heat of iron? (The specific heat of water is 4.184 J/g°C)

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.